Warp-cutting device for use in pile-fabric looms



Jan. 1, 1924 1,479,274 J. A$HMORE-ET AL WARPCUTTING DEVICE FOR USE INPILE FABRIC LOOMS Filed April 2o. 1925 fir-a 16 4 l l] v ATTORNEYS.

Patented Jan. 1, 1924.

Unirse stares JOHN Asnriionn AND encuen iisniuonn, or rnipniannrnia,rijNnsYLvAiviA. Y

HARP-CUTTING DEVICE FOR SE IN PILE-FABRIC LOOIIS.

Application filed April 20, 1923. Serial 110.633,37?. l

Our invention relates to a class of devices' employed to sever the warpsof woven fabrios out of which velvet, Axminister or Wilton carpets, forinstance, or other pile fabrics7 are made, and which is variouslytermed, in

the shop as a carpet wire, and, in untech-V nical language, as a:cutting knife.

Coniining ourselves to the expression cutting knife, it is toA beexplained that'in pilefabric looms a plurality of these cutting knives,identical with each other, is used, and that their curved cutting edgesare drawn through the warps by various devices, the knives, from a.normal plural placement in the loom, being one by one drawn through thefabric, and each, after ithas done its work of cutting the warps, beingreturned to its original position.

As these knives have heretofoi'ev been formed, it has been necessary toconstantly sharpen their cutting edges, sometimes very frequentlyindeed, in order to prevent the tearing of the yarn resulting inpractice from the operation of vthese knives when their blades are dull.

It is the object of our invention to lessen and almost wholly overcomethe tendency of these blades quickly to `become dull, and this object weattain by the simple expedient of cutting an oblique slot into theoutwardly and upwardly extending curved cutting edge of the blade of thecutting'knife as an entirety,-the knife being otherwise similar ingeneral characteristics and formation to those which for many years havebeen in use in the art of making pile fabrics. Y

t should be further explained that our invention resides essentially inthis construction of the cutting blade of the cutter, and that in orderto effectuate the mounting and reciprocatory movement of the cuttersacross the fabric and lengthwise of the loom, a loom the framework ofwhich may be of any conventional or desired construction, and a meansfor reciprocating the cutters one by one along said framework similarlyof'Y any preferred construction operative to the end-in view, are to beemployed.

In order to illustrate a loom in which 4rto mount and a means toreciprocate our cutters,'we have in the accompanying drawingsrepresented typical embodiments, in Figure 1 in side elevation and inFigure 2 in fragmentary perspective, of so muchof a loom as is adaptedto carry land permit of the Voperation of, and a means forreciprocating, our cutters,-illustrating in Figure?) in perspective acutter embodying our invention.k Similar numerals of reference indicatecorresponding parts.

Referring to the drawings:

1 designates a loom framework of any Y preferred character, and 2 acutter-carrying bed upon which are mounted our cutting knives 3, one ofwhich detached isillustr'ated in Figure 3, and anydesired plurality ofwhich as mounted is illustrated in Figure Q;

As a convenient means for eecting the reciprocation or end-for-endtravel of a slide Y 4 along the slide-way 2, we use the followingconnective gearing 6 designates aV pair of fast and`v loose pulleyssuitably mounted upon driving shaft 7, a pinion 8 on the freeendofwhichr shaft engages with a spur wheel 9 on a driven shaft 10 Vsuitablymounted on the framework and having at its free end a driving bevelvgear 11 in engagement with a driven bevel gear 12, which being connectedwith a disc on which is an eccentric pin 13 serves as an eccentric,'aneccentric rod 14 making connection with the lower'end 15 of a'bell-cranklever 16, the upper end of which is by a link 17 connected with theslide 4.

QbviOuSly, when the` driving shaft 7 is caused to rotate, through thepinion 8, the spur wheel. 9, the driven shaft 10, the driving bevel gear11, the driven bevel gear and eccentric l2, the eccentric v'rod la, thebellcrank'lever 16, and the link 17, the slide 4: will be caused toreciprocate in its slide-way 5 onV the cutter-carrying bed 2. y

The connection between the slide and the cutting knives is through ahook 18 pivoted to the slide t' and adapted to engage with the hookrecesses 19 near the base 29 of the cutting knife 3, as particularlyillustrated .in

quire no further description, but it may not, Y'

be improper to explain that after each cutting knife has in turn beendrawn through the warps, it is moved laterally across thecutt'ercarrying bed 2, conveniently by the properly tiined operation ot'what We term a. replacing' hook 20, mounted on the tree end of atransverse bar 21, which moves through a slide bearing 22 mounted on theframework and is .caused so to move through connection with the upperend of a rocker' arm 23 pivoted at 24, thelower end oi which arm travelsupon a cani 25 mounted upon a cam shaft 26 housed in the framework anddriven by a toothed pinion 27 in engagement with the spur Wheel 9,-andthat thereafter said cutting knife will be returned to its norinalposition in the plurality of knives. v

28 .designates the usual take-up roll for the fabric which is to be.operated upon.

' Repeating the statement that the above described loom framework yandmeans for reciprocating the cutters, are typical merely of devices ingeneral use for the PUl'pOses mentioned, and that other means operatingto support and actuate the cutters may in their stead be emplcyedrthe,Cutting knife, or carpet wire as it is technically called and which isillustrated in Figure 3, is the device in which our Vinvention primarilyresides and is of the following construction A long shank designated bythe number 3 terminates at the rear in the base or buttend formationdesignated 29, the peculiar outlining of which is well undertsood bythose skilledin the art and need not, therefore, be specificallydescribed except to say that it necessarily embodies the hook recess 19into which the hook 18 on the side 4; is entered to etl'ect the pullupon the cutter.

The advance end of the cutting knife is, however, formed into Lthe usualoutwardly and upwardly-extending curved cutting blade which we havedesignated 30, the sides ot which are oppositely curved inwardly toV thecutting edge designated 31, so that viewed in transverse section thecutting blade presents, in a sense, the curvature of an old fashionedrazor blade.A l '.32'de'signates a slot cut obliquely into the cuttingblade 30 within the contines of the cutting edge 31.

into the blade thatwesecure the result outlined'in the preamble ot' thisspecification, ot great dura-bility of the cutting edge, 'a

result in which the advantage of our invention inheres.

le do not confine ourselves to the depth or specific degree ofinclination of the slot with reference to the longitudinal axis Vof theblade asv an entirety, or to the relative inclination of'said slot withreference to lthe curved cutting edge 31 of the blade.

`We have, however, illustrated in Figure 3 of the drawings a good depthand inclina- It is due to the 'introduction of this slot tion which invpractice is at present preferred.

by us because we have found it to give satis- 2. A pile-wire having,formed integra-lL therewitha blade, the cuttingfedge oit which extendsin a rearwardly direction, said blade having a slotted portie-intheslot. or' which extends in a substantially rearward direction andintersects said cutting edgeto provide ai'elatively flexible cuttingportion.

In testimony whereof we have hereunto signed our naines this 19th' dayof April, A. D 1923.

JOHN ASHMORE. GEORGE ASHMORE. In the presence of* N Bussincsn. EMILYIzena VoGDns.

